Journal Article Measurement of the forward-backward asymmetry in low-mass bottom-quark pairs produced in proton-antiproton collisions

CDF Collaboration  ,  Hara, K.  ,  Kim, S. H.  ,  Sato, K.  ,  Ukegawa, F.  ,  Takeuch, Y.

Physical review D
93 ( 11 )  , p.112003 , 2016-06 , American Physical Society
ISSN:2470-0010
NCID:AA00773624
Description
We report a measurement of the forward-backward asymmetry, AFB, in bb¯ pairs produced in proton-antiproton collisions and identified by muons from semileptonic b-hadron decays. The event sample is collected at a center-of-mass energy of s√=1.96  TeV with the CDF II detector and corresponds to 6.9  fb−1 of integrated luminosity. We obtain an integrated asymmetry of AFB(bb¯)=(1.2±0.7)% at the particle level for b-quark pairs with invariant mass, mbb¯, down to 40  GeV/c2 and measure the dependence of AFB(bb¯) on mbb¯. The results are compatible with expectations from the standard model.
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